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Running a bulk update from a conversation is convenient, which is exactly why it is worth knowing what the guards are.

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It spends real credits

One credit per page, the same as the console. A run over 400 pages costs 400.
You are always shown the count and the cost before agreeing. If the numbers look wrong, the condition is wrong — ask for a different one rather than approving it.

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It adds to pages — it does not replace them by default

This is the one real difference from the console, and it is worth knowing before your first run.
Ask Claude to apply a template and each page ends up with its old content plus the template. If you expected a clean replacement, you will find duplicates.
Say so explicitly if you want the old content gone:
Apply the template and clear the existing content first.
Clearing is irreversible. Your database rows and properties survive it, but the content inside those pages does not come back from BulkNotion. Try it on two or three pages and look at the result in Notion before doing it at scale.
Either way, running twice adds the template twice. Check History before repeating a run you are unsure about.

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Guards that are always on

Nothing runs without a preview. A run has to be based on a selection that was previewed and shown to you. Claude cannot go straight from “update my database” to running something. The count has to still match. If pages are added or removed between the preview and the run, it refuses rather than running over a set you never saw. You will be shown the new number and asked again. One run at a time. A second run asked for from Claude while one is in flight is refused. Nothing is charged for the refusal. (The console does not hold you back this way, so avoid starting a console run over the same pages mid-flight.) Not enough credits means it does not start. It is refused up front rather than running partway and stopping. Nothing is charged and no page is touched.

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Good habits

1

Ask for the count before agreeing

“How many pages does that match?” — if the answer surprises you, the condition is not what you meant.
2

Look at the example titles

A preview comes with a few page titles. They are the quickest way to tell whether the right pages were caught.
3

Try a narrow run first

Apply to three pages, look at them in Notion, then widen. Cheap insurance on a template you have not used at scale.
4

Say no when it looks off

Nothing runs until you agree. A wrong condition costs nothing if you do not approve it.

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When it refuses

Refusals are not failures to retry around:
None of these charge you, and none of them touch a page.

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Next

Credits and plans

Allowances, refills, boosters.

Troubleshooting

When something has already gone sideways.